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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06dc4542a2f6f8db1aae9c98f7e623a52b6a8c5ea9003f82a2cb8ccc9f44822c' 
  AND token = 'iM2jQ897IIwpd2jPA2VfwIRS9TlWo04gYLPbF2igKMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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