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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63baa342c04c8af10c4f80f6f6fb853ce3d55abe435f565bdb88ae132c417a93' 
  AND token = 'mtLcXiFUyPaKj025TkDR+4KCwIQNdfiRrMk+vglf3gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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