SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fea451c6a3221583c40255107ac79cdc948f0693686e6be827be5d691cdfd4f' 
  AND token = 'd7i/GmBAdBg8w+0d0H4+9F/pe9MMVQgNU/+KdVqKTj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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