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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b733ff58ed5046051f5a566c79063f69ef04c0ad35d3b6886d422af07b36b6c' 
  AND token = 'RZ6cEro/yFmlVFvvvWN6mdA1fdyb9qttOpTj+sTguUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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