SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd48429ffb0ecf223c6aac175d11f2e13c537c5bf4e0d95e285ba5896030db99' 
  AND token = 'qmRiJW+RdyvG9wuLznhdYQ8jYarmi15JE91EUzUY+Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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