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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '244a413758a4354288587365953091ed5d1430434a86ee17311db22f360318e4' 
  AND token = 'm0A6AA4xabfVnpoPYoyiXeEtBc4uaI6s5nHt+OEvves=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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