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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd2e6eb22f4c9be41c35cb68ef2aed42e239f80071a5e0b9415e7e8e8b7b57f' 
  AND token = 'ua4sqVdaNLVhNPXntijeYe57gaR69Eddm9thxtsIfjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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