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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83096e16e33fb069cbe6717a82563e99075c5845b69c35e26b0297a3367c193f' 
  AND token = 'mlZY3uBmfrq0g58EBrrP+TL9gp7BFk6JBoxqfHSWuJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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