SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80ce731f82b49ae23b5a1ff7a6a4feb2a93b7b191cbeba5c42646076473628aa' 
  AND token = 'JJW81WGwoIdxWGwFTEFvNhWYdqbVLgdBJnCbIiWzjh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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