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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f36bc6359d52e5e288dadcac93f67bbd940b200320a82554bc72510f7bc337' 
  AND token = '0Ip52Zw5nQ+6Afef9Fg4gSSKBl1YfwRyXfK8FuR5DWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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