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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fce60bd02f294a633c1be2f4c0f1d5d95b79a03e9ff05c33fc115bcc6f382cbe' 
  AND token = 'jg41uMQ0JrpzyEyJIj7qJRaAhSINWsheVGE1R9NVKzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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