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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '510936d0b323e3f17d454307c140577ec596b9954d51e19658b39ea593cdd983' 
  AND token = 'YuNRFl2W96meKi0k5BNTCh0PfZadG3qw1WMB44qPo6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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