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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd387bd688963e019ea5b86e61601ba974060f93b06588f9b18cb37820d48b853' 
  AND token = '88ak4uYBkTITczMD43l7eW7eCiNzCgHhBm6Y/E57FzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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