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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d19e6bbf55ef2fb3cb328e70179992bb933feb4b1cc0cf9be62bf24ffac8fa2' 
  AND token = 'wFsh1yxqYRcyaRQC9uWtEBwIkBnpBbLNfY2HcikSdNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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