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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a04a78ab3f35f1f91334a5dc7d5fd31ca087f524f75902e26eb9c4420cf6006' 
  AND token = 'ueXuNJ/XlyW9USywFW0IXqCqkm51cssNydOkU8L7/3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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