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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15ab2e0c52235e5ac42b97225eb8c7de4c43b55fbf66c5ca42dea0e7fbbae7ba' 
  AND token = 'ffLfscOxZ4IzLi0bFhkf/PCOsKJJm9gCjIxa4cFx6II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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