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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9a31ae007e758726a65e7544bacc60bbea69fa988665ad12406b0ea687475c4' 
  AND token = 'Nb4UGRRquv7P9Tj6yld5jV9CJ0LF/5mLb9/CZmcAUDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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