SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3af8081ba7d6e8b2bf8cb7ff193e46ae43cc80ce537570a05589eb58b846e60' 
  AND token = 'z1PpH8fBG2oCA3HUX/nqJuKDGboWX5wLLi/Fm3ZVSq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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