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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8808179e920843cb79d0319b127a5c8f985e557f1d9b56f21edaa9e54150092f' 
  AND token = '8n+hg5rz/8x85MvjT+TTdusTeWRSi3Ou06d1nvgREmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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