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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd301e98beb02146eacd4acf91d95d76830621e7971ac9f55fae7e88baf6b0884' 
  AND token = 'zMH8Fmtg3XCFzZg6hcIiXiunyhQh5WBA8X2s7GUIu7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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