Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb5703f67d386f0b028bc20614f0345a23d843d91a56b5e8fb6e6c51930c77c' 
  AND token = '4usJcTnpCl3w5oEcmzQ8fHivBZpF4V+m1Tlxen1yTwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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