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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd82fa6b696c23bc7aaa63fe6f21b37ef6417f17856429537973030759c2cab' 
  AND token = 'EgipU8TbLu+HKX8u9rka12ECN8zwfxbiQ80PO89aees=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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