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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc1b55b07df88658e5d2ab8fb6cb9a7d1577aebcd257b323ed018a4443ae9e2' 
  AND token = '5tQPdPj08+KhC+HfmF3q7/ypKBybC0MiORtcwgy8CqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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