SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65efca3baa99921831beaaa57861c4603a20713b5398b77e7c940bca67fe4268' 
  AND token = '/giGcTRcmZKA/4M4luqu3ITMQpzznSbODFep+k/BvUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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