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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c44a6e7a8b292b3d2c31fbfd25dd2046da9083cc111b54fa111f31b9d37549' 
  AND token = '2BAdpmWG6gP75qbTxngS1ccIUCQuRzgmJ6YLoTu4Goc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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