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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb6f1ff84e4705bb0eb9a99284d87eb5935bbc484151637f9632e29a61be8e9b' 
  AND token = 'WgWGcE0TJBLU2YH6f7QmXEVRXfnCDe+uDqKBxfu37is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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