SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c41e198fd35beccc9a562ed521ad4a03064719b8e7a99526619a41e865cb5c' 
  AND token = 'jtoxRx9krvYiFWzUEGmuEPF0YVfXH7A8drbb3jcT2iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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