SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd656a9d47e698bd311646e8e2dfd45b4cc895c346332aa7456fb28ffa8aacf' 
  AND token = 'Fj9Yo8rHug4lzaR9PS1/OUGlVQmNo7U4nv+NOYoUgw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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