SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f26b2b50b7c8f5f48cd23779c0bfff4e9e02752681709413f76d4980e51be90c' 
  AND token = 'JGPlKvfxzO/sTAwm+c9Eo1bHSu8aftGKl5NfZvYGm/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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