SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0025d47f524ee1d81846419718d67952cc19fce4f31c5c7cdf2dc82f2094f69b' 
  AND token = 'ty7w9enh+zgMvRQiazCv2oBVgWaSxa0JVZpgE0lrhw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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