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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970ce04af2d4a49a8bb5edf036ff76cd6abab5d951b2038404c851a1d4f34550' 
  AND token = 'rqGuo0mBbkUEo4rJzWGtEZ5cs0NY85B6j0RMEBJmV5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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