SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a06623f437f7ef84094d7ff4f117b35a022638c0dabf3f2d1e541583a81551d' 
  AND token = 'vJYFcYzyqU1UE4vw4m3Q7KJlhA3P0f8cgCEaGgGjpNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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