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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'affbfb96e768224013e18891c0ae77128a2491a705b76c8a677c3b6d1151a238' 
  AND token = '3PDVLHE3XaSvFFEbjKM2UQtpoutvcNjffKgyUbWU0c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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