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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba265f6c743b6bc669b50e1dd9b6fc21ed7e860bc50e6af5400d838ad852e3aa' 
  AND token = 'GfvJVwrpxaF/0pE85M09yHlWmYV2lNMOASJ0Z92oRrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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