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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f59ea75ef362f7d1ee60875dcea7feee1b355199be7a0fa573958f78a4b7af5b' 
  AND token = 'gbdGQeA22Lp/vI1+9xsUHrt4REec8s5ucPYtQfwvHmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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