Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c263b8bd9102affc4d6ebc6b0f1b7409e60f932a5f2a3e72c19bb2c49da55a' 
  AND token = '4vgZlgkKicwdveJmH5XPcnUtsCUeM+fJwfTV/dx99oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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