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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c9b051ef5c3a5f9fb689bc9bef2bec79c683c90fa665ed03de6e1c63ec6b8c' 
  AND token = 'wECyd6ankUtARzapXfYqPnsDtStjSc18Px3zW9ReiqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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