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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd062f83131cee7406c60705e89b987ac6a216ba2f996476675d322006fbdf58a' 
  AND token = 'D3BsV79aeS1P4h7ImtmJ+GppR10wTz4Tw3PhYjeQOdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}