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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db6fc0af56f1cd2fc1432b489a4aea72a38f47446786ad505378d554ebd437ee' 
  AND token = 'uGwCCjTdO9TiPgYEG8YO3csUuZ3NeyxjemAnxx7Ph/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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