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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5558ffe79cd670f1ba143781020f68bd92c7f65240caa4bc3ce2c5a60bcf153a' 
  AND token = 'ET5W66CfjSxAW9g29eZNSVsHhNRh3NIqf4EEBdQXOSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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