SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd410e3b0ec2b25dffb874539a4a1f2ccc1093fd3ea69c559a3e4272541f4a594' 
  AND token = 'bB7xg1fdOjxUfHzQPYyY7+6w//TvY/i2IIhv4u1ZSuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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