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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41f04e280e03fd1b39bcd0dfe014ab6dcb2f40ed76226309ff039713fd96bcf3' 
  AND token = 'gzZlMirdvVN9G17UP2nTFRWVdemCS3uQR4X2bSTyRsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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