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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfce24956ef039e82f5ab0890b17fed2b644b8e858ede355d5f047041761eb56' 
  AND token = '6r5vv6CAAJG8Ay3XoWRcPkja0ih1b8FnNiu3eIRvrEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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