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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5dbfab2212d548ce08108b28103587d6dafb3874cec72e07fea8f0387891929' 
  AND token = 'GfswMqlet7h/p4Lgx+AjY1wlhpeeE4ME6ovPIoAhUrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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