SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a970ae2148dd9ed4f4ac6d4b30463f2cf67fe557105a804be53e634b7192f004' 
  AND token = 'TIQMZPGjlJ2oH0BdYi4kmgFDT6GYCHQd7z230YKLphI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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