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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6304a4c7dbe5c5a62cd21c71823feabed414fcb6104131ba9c99631cbfab2ebc' 
  AND token = 'y9TUzrbOHgnA4x4KgOcPJU5BpD8iDRrTAlFMZ/c5SPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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