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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af5d569c7833c9b0bb2b867e51f4e9a7af7d8050597f021076c0f7af28c262ae' 
  AND token = 'HmBbEW60qTwtUJcgiJ7LOe9NseB0lyig/C/0VDCNLSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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