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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efb26b8327ce6514c0cd64c2e165d7350adce656c9949cc466c5c167ca705944' 
  AND token = 'uQD9y88xa9nCdKnsS+9USNrp/WPo78Hb4xMjWhifd7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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