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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd63c84195c5c2fe81c3c0c8688e6e7b2f2912c31eeac0c00bfb13805ce9706ad' 
  AND token = 'H7O3lrFhtzJKbecLtoCLgMQGzgIVl8nyWgf4ACkWQWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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