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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '344589649cef5a8c28f7785b18edbd391105ce102fc6d3a47cf3e5cf2c1a9654' 
  AND token = 'CGI7/m9RNOcBv0db6oQHmJfVlxlpBnHEHijt6lCccV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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