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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e8fe0fbbbbbd0e17062b45eeff2042ec855498c237da8e2a675b35a985b7c0' 
  AND token = 'GlIBNqSXhGXFnRXt/1inZZB6bDZmiRbZUN3doHMQpD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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