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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7cc1cac36416d7425874e3fdc228fc2da96f8b1a3ca5bbb60b7cc805881220f' 
  AND token = '30iSy18+kfAQThOYVTY/msHL/c7MAoS0mgyB98uo7OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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