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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c391c571de7dae3d8ed0424695c5b1f3db5388c949ecfc2286e3b7e31271c36' 
  AND token = 'kLuTtEq22Ui5VMxTIs+3J/8V6j8Q3wuOlzsvaWpZqVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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