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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc0fa568f2bdced7379a79f3cebac22fbc51777897e3995d796c3b339772ffd' 
  AND token = '6yvkDm9pGewtXQhpWHpCz4e2O4vldzM5rdycsa7vTLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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