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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56f37376866fc76c126ae7e1652900d572084e1dc441fe9aa134b4cb3bd2312' 
  AND token = 'FF4DE7mg90oRXrhZfxs00Pvk83sJvKI9dZasc6uuhLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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