SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f586828eead2d4094a7d7be2010207dd40b0766f8c2838e624d13c09e498fe4' 
  AND token = 'Eiy0vIJz92jQAnvX1+mqwQ/1+CCQJhlv5AwZ5x+T3Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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