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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea3e5353bb7c15875ff7aaa5665c73855869a92c500cc8bf7661879b65ded23' 
  AND token = '0kGaqc3ei3hm37sP4m9DaoHfycBpW/YF6E2h5YQlINI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00126

JSON explain

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