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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '596b947f82b4d68996f670fb3235382c9669216eb63f38c49b6ce16a16ec084e' 
  AND token = '/YKvCNWvNQ5xhZ/sob0frPq/Ah4Pm9aQnTraaoiji8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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