Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe3518938c184109a8edb420455001ef92b07e5162a73214adeb7b85fb93067e' 
  AND token = 'Egun0qWaWYYHTFQaBU2YiABmYOfTv142YcFuM1xcBoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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