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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b96d4dae59e3e5eece5ca5aeb856835b159a70b02f4f39a6315b17faf04b7b06' 
  AND token = 'jclsqJV+YXM/M5FMpwMQUtPCiVRUmL7H7gtqoTFDwEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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