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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd960323afccb60b92885829b5e5439ea2cf577556b35719712a2b96874a168b7' 
  AND token = 'AT4v29gijK7vD5McnI6aZpv7B+itD03IawXl7CdpFXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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