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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '560ce29bf11e7d0e94c763590fdf8323cd02567a727c18c8e2dfb3dc311a86a2' 
  AND token = 'Tr3sz9lIyzASUi2QmDqdzn4CDLke2EcUxMXIlZPrCPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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