SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2f4ef5d9452c473835551d234c6d5510a69680aa27aa73cf6f6956c11e8ffd' 
  AND token = '/XKFq6Wr4z5ig1KPo7RS6XxeILJPhlYPOVmRgj7ap30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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