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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5090f9fb40228227c15f4675bcfed0bf6b8e0164c7635bd06bd82dbe4f3ca65a' 
  AND token = 'aWSN2KhAajSXJUxwF7pfyct8xYaeaGbAYZd2De8SDOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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