SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dcf05e11ef6d48637a9ab3e221a9b166cb282aba8491ed65490d071f62efd44' 
  AND token = 'j6chV7Mt8fsPZBEY8GtthRvIGB1viOfZ/uc0Ky0XTKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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