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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80adbcf32c542b203e1f8a686186211d7391cca1915dd6c6b64798910a9c3484' 
  AND token = '+xBbRiwUAuodbGsCZ0oejmuzhtTY0Zeo0ZACX0crTGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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